Centrifugal mold and liner therefor



Jan. -10, 1950 E. R. OLSEN ETAL 2,494,405

CENTRIFUGAL MOLD AND LINER THEREFOR Filed Nov. 18, 1946 l/Yl fn mas.

/ 6 4 4 If 70m y (k/ford MA /76a @JMLQ Patented Jan. 10, 1950 2,494,405.- CENTRIFU'GHL MOLD AND LINER V THEREFOR" V ErnestsRw Olsen} Rudolph F. Flora, and answer. L'onnee; Muskegon Mich assignors toHastings- Manufacturing Cbmpany Hastings Mi'cli.

Application November 18, 1946-}. Serial Nb: .71lb45fli This: invention; relates: mold linen Theapn'ncipalzobjects of; this :invention ares.

first; tn provide a:v liner: for: a; permanent. cen-i trifiigal: mold having insulating: properties: for: protecting: thee mold; and: which; presents: a. cone tinuous smoothv surface. ion the. casting: of: metal: therein:

Second, to. provide. a liner; fon' 3A permanent centrifugall mold which: mayv be. formed out? of sheet: asbestos and: with: a smooth: surface which will not form ridgesion a'vcasting formed: therein;

Third, to provide= means for securing the'longt tiudihal edges: of a: sheetasbestosliner in: flusha'buttin'girelationship tmform asubstantiallp con tinuous casting: surfacefor a tubularmold Other objects and advantages pertaining: to the detailsand economies :of "the inVentionw-ill beapparent' from" the following descriptiom and claims.

The drawings, of: which: there is one sheet; illustratea permanent centrifugal mold and four forms oi linercooperable therewith to form an insulating casting surface.

to improvements: in:. al

Fig. l is a perspective View of the mold with Fig. 3 is-a fragmentary perspective view partiallyin. cross section of; a. modified form. of?

clamping. means. for thezlinerrillustratedj in. Eigs. 1' and 2'.

Rig. 4i isa. perspective. view: of: a; further modifiedl fonnzoif. clamping means fora. liner.

53 is; a. perspective. vierwoff a1 modified. form of:'liner.

Fig.6 issazfragmentary perspective View of'the clampiiig. strip. shown. in. Eigt'. 31.

mg" 7 is; a. fragmentary cross sectional. view showing: in; greater detail. the; ioinii between; the edges of the liner. shown in Eig:

Reference is. made to our copending application for Method'and apparatus for making centrifugal-castings, Serial K m-6965877, filed September: 13; 194-6; in. which: is disclosed a ventilated permanent centrifugal mold member lined with a liner of sheet asbestos or other heat resistant material which protects the surface of the casting from becoming chilled by the walls of the mold and which renders the casting easily removable from the mold by sliding from the mold along with the casting. This prior lining is freely supported in the mold and has unconnected ends 6 Claims (01. Wit-11325,).

so that in use a fine ridge of metal escapes 55 throughthe jointubetween the edgesof the liner; and becomes chilledlagainst.therwall of; themold 'Iihe present: invention provides-a liner. operable: in; molds similar tathat disclosed in; theabnvei mentioned: applicationv and in our? copending ap plication. for: @entrifugal. mold: and. liner, Serial; N01,? 10.;4-etQ ,fildl November 18; 1946,, which: presentssa substantiallwsmoot-hrand continuous surface to:thes molten metalpourediinlthewmoldzand: from which no metal can escape to formiaanldgea on the: castings As; is showm im the: drawings;- the? permanent:- mpidi membeii l1 provvidedl with". as pluralitm off lnngitudinallw amending: ventilating; grooves; 2-: along" the inner-r surface thereof: and; a: relatively wide; and: shallow; groove 31, TiHl-I moidi h is; dee signed to operate in a centrifugal molding-mar. chine. similar? to; that disclosed: in: the aborvementienedi application Serial: No. 69.6;8'7i7i.

PLositioned within-the mold l: is:- aalinerr which'z preferably formed: of: sheet asbestos: or: some similar heat resisting: material'i having: longitudinal: edges 5;broughtinto: closely: abutting andi smoothly. aligned. relationship, seaiing' strip; 62

. isisecure'dato :theeouter' sides iofsthezedgesamambyraa suitable adhesive. 12 and the. tubular? liner; thus: formed isxp'e'sitionedl instliei moldiwitli th'eis'ealings strip positioned in. thee shallow: groove- 3: in: the; mold wall. The sealing: strip 6: may: be in; thee 1 form: of? a; metali bandi or may: consist of" a1 strip ofiasbestossimilar. to thebody ofi theilinen.

*Whem moltenmetal? is cast in the mold; andi linerjust described thesurfaoe of the-.castingswill: be: substantially smooth: and? continuous; there: being no spa'ce for:ittoescape betweemthe edges: 5' of the line r. 'Dhe' insulating properties-off the asbestos liner: will prevent. the castingfrom be coming chilled and hardened andi Willi at the same time protect the surfaceeof tliepermanent; mold I: from becoming burned andicraclr edi' 'I-l'ie castings thus forme'd beeasily removed fromthe mold since the" liner will-adhere to the castin'g slide: easily: on: the: inner surface of the; moldl- Figs; 3 and illustrate aliner 4 which is the same inzall respectsasthe liner shown-in l i'gz 1-' except the sealing strip i's inthe form: of ametal band having inwardly turned teeth 8 formed along the edges thereof and knock-in prongs 9 formed in the body of the band which are arranged to pierce and be crimped around the edge portions of the liner by a suitable pressing machine and mandrel similar to a stapler, not shown, to tightly clamp the longitudinal edges 5 of the liner together.

Fig. 5 illustrates a modified form of liner #3 having its longitudinal edges out along mating interlocking wavy lines 5B. The two edges of the liner are secured together prior to insertion in the mold by a series of stitches H) which are formed by a suitable sewing machine. The stitches are preferably formed with an asbestos fiber thread or a fine metallic wire.

Figs. 4 and 7 illustrate a further modified form of liner 4G in which the longitudinal edges 5 are secured together by a series of staples ll driven inwardly from the outside of the tubular liner and crimped around in the body of the liner by a suitable mandrel, not shown.

In all forms of the liner illustrated the abutting edges of the liner material are firmly held in tightly engaged and aligned relationship to provide a substantially continuous inner surface for the liner. Thus relatively inexpensive and commercially standardsheet material may be used for forming the liners and a continuous casting surface may still be obtained. All of the liners function as set out above to improve the quality of the castings formed in the mold by preventing chilling of the castings and to speed up the casting operation by rendering the castings easily removable. The liners further conform accurately in contour to the shape of the tubular mold and do not bulge inwardly into the mold cavity.

We have described several practical forms of sealed and flush joint liners so that others skilled in the art may reproduce the same or minor modifications thereof without further description.

Having thus, described our invention, what we claim as new and'desire to secure by Letters Patent is:

1. Casting apparatus comprising a permanent rotatable undivided tubular mold having a plurality of longitudinally extending ventilating grooves formed on the inner surface thereof and a widened groove formed on said inner surface, a

liner of sheet heat resistant material positioned in said mold and in closely supported facing relationship with the surface thereof, the longitudinal edges 'of said liner being closely abutted and disposed in front of said widened groove, and a joining member securing said edges together and positioned in said widened groove.

2. Casting apparatus comprising a permanent rotatable undivided tubular mold having a longitudinally extending groove formed on its inner surface, a liner of sheet heat resistant material positioned in said mold and in closely supported facing relationship with the surface thereof, the

longitudinal edges of said liner being in closely abutted relationship and disposed in front of said shallow groove, and a sealing strip of metal having inwardly pressed teeth on the edges thereof and knock-in prongs in the body thereof positioned in said shallow groove with said teeth and prongs in clamping engagement with said liner to hold said edges together.

4. Casting apparatus comprising a permanent rotatable undivided mold having a ventilated mold wall surface and a relatively wide longitudinal groove formed in said surface, a liner of sheet heat resisting material positioned in said mold in closely supported facing relationship with the surface thereof, the longitudinal edges of said liner being in abutting relationship and disposed in front of said groove, and a joint strip in retaining engagement with said liner to hold said edges together.

5. Casting apparatus comprising a permanent rotatable undivided mold having a ventilated mold wall and a groove formed in its mold wall surface, a liner of sheet heat resisting material positioned in said mold in closely supported facing relationship with the surface thereof, the longitudinal edges of said liner being in closely abutted relationship and disposed in front of said groove, and a joint strip on the outer side of the liner covering the joint thereof, said groove being adapted to receive said joint strip.

6. Casting apparatus comprising a permanent rotatable undivided tubular mold having a longitudinal groove in its mold wall surface, a liner of sheet heat resisting material positioned in said mold in closely supported facing relationship with the mold wall surface thereof, the longitudinal edges of said liner being in closely abutted relationship and disposed in front of said groove, and a joint strip in retaining engagement with said liner to hold said edges together, said groove being adapted to receive said joint strip.

. ERNEST R. OLSEN.

RUDOLPH F. FLORA. CLIFFORD J. LONNEE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date I 229,278 Schuknecht June 29, 880 359,483 Whitley Mar. 15, $88? 380,104 Gingras Mar. 27, 888 384,465 Packer June 12, 1888 399,489 Budlong Mar. 12, 1889 431,175 Southwick July 1, 1890 661,143 Grasser Nov. 6, 1900 665,865 Baker Jan. 15, 1901 1,249,101 Jacobs Dec. 4, 1917 1,590,392 Peters June 29, 1926 1,595,193 Hopkinson Aug. 10, 1926 FOREIGN PATENTS Number Country Date 242,405 Great Britain Nov. 12, 1925 

